Electric welding system



4 5 0Maw%z0m M/V WZQ v D. H. WILSON. ELECTRIC WELDING SYSTEM. APPLICATION FILED DEC. 31. I914- RENEWED FEB. 24, I916.

1,3U'KU3UU Patented June 17, 1919.

INVENTOR ATTORNEY w ri DAVID B; WILSON, or rnrnnson, new JERSEY.

ELECTRIC wELmiiG SYSTEM.

Specification of letters Patent. Patented J 111mg 1W, 1119119,

Application filed December 81, 1914, Serial No. 879,955. Renewed February 24, 1916. Serial No. 80,126. i

To all whom it may concern Be it known that 1, DAVID H. WILSON,

citizen of the United States, and resident of across them.

My invention further consists of a circuit controller to automatically raise the voltage across the arc terminals to compensate for the rising resistance due to the separation of said terminals while forming the are.

In the drawings 4 The figure shows a diagram of my circuits and apparatus.

From a suitable source of welding current 1, a circuitisestablished by way of a conductor 2, through the regulating solenoid 3 and the solenoid 4 in multiple, conductor 5, through the carbon pile 6, to the hand tool 7, adapted to carry the metal welding pencil 8. This pencil is adapted to be brought into contact with the work 9 which forms the other terminal of the arc and which is connected by way of conductor 10 to the positive electrode of the source of current 1. The carbon pile 6 is subject to the influence of the lever 11 pivoted at 12 and adapted at 13 to exert a heavy pressure upon the pile from 1500 lbs. down to 800 lbs. according to the current in the solenoid, owing to the influence of the compression spring 14, normally. inactive, and to the influence of the solenoid 3. The spring 14 is caused to exert an upward ressure upon the lever 11, when the solenoi 4 is energized. This solenoid attracts the armature lever arm 15, so that its socket end 16 lifts the ball-shaped end 17 of the spring (against the tension spring 18) so that it exerts a powerful pressure upon the spring 14, thereby exerting apressure upon the pile. The lever 11 is prevented from opening the pile beyond a certain limit by means of the abutment 19 which may be an adjusting screw mounted in a fixed support 20."

When the pencil is brought into contact with the work 9, current energizes the solenoid 4 which at once exerts a spring pressure upon the lever 11 to reduce the resistance of the pile. The solenoid 3, however, has been energized at the same moment that solenoid 4 was energized so that the lever 11 is subject to a downward pull by the solenoid. The pressure of these two opposing forces is such that the lever 11 strikes a balanced relation between the two. This happens the instant that current passes from the terminal 8 to the terminal 9. Thereafter as the terminal 8 is lifted from the terminal 9, the resistance at the arc is increased, the current flowing through the solenoid 3 is reduced, the ull of the solenoid uponthe lever 11 is reduced, the spring 14 exerts a greater pressure upon the pile 6, 1

and the resistance of the pile is thereby re duced. This operation continues as the arc is drawn until it is established. Thereafter, any variation in the arc causes a correspond ing variation of the current in the solenoid 8 which at once influences the lever 11 and its pressure upon the pile 6. The resistance of the pile is varied inversely asthe resistance of the arc. After the solenoid 4 has once acted, any weakening of the current flowing through its coils has no efl'eot upon the lever 15 and no effect upon the spring 14.

The spring 14 has an established length such that in the active position shown in the drawin it exerts a pressure upon the lever 11 su 'cient to at a given maximum pressure of say 1500 lids. on the pile. When the armature lever arm 15 is released by the solenoid 4, it is drawn to the left by the tension spring 18 increasing the distance from the lever 11 to the socket 16, so that the ballshaped bottom of the spring support 22 is liftedofl' from the socket, owing to the tension rod 21 taking the compression of the spring.

The abutment 19 then exerts a pressure upon the lever 11 to produce a given minimum pressure upon the pile of about 800 lbs.

may be 1. In a welding system, in combination, 7

a source of welding current, two are terminals in manually operable space relation, means in circuit therewith operating with a graduated inverse reaction to limit initial arc flow, and a coacting series controller gradually acting on said means to automatically vary the voltage across said terminals in compensating opposition to variations of arc resistance.

2. In a weldin system, in combination, a source of welding current, two arc terminals in manually operable space relation, means in circuit therewith operating with a graduated inverse reaction to limit initial arc flow, and a coacting series controller gradually cting on said means to automatically vary the voltage across said terminals in compensating opposition to variations of arc resistance, and means responsive to cessation of welding current to automatically restore said apparatus to initial condition after rupture of the arc, said means comprising a spring actuated toggle and an electromagnet opposed to the spring efiort thereon.

3. In a welding system, in combination, a source of welding current, two arc terminals in manually operable space relation, means in circuit therewith operating with a graduated inverse reaction to limit initial arc flow, and a coacting series cgntroller gradually acting on said means to automatically vary the voltage across said terminals in compensating opposition to variations of arc resistance, and means responsive to cessation of welding current to automatically restore said apparatus to initial condition after rupture of the arc, said means comprising a spring actuated toggle and an electromagnet opposed to the spring efi'ort thereon, and a. lever interposed between the toggle and the current graduating means and comprising a floating solenoid core, and

a solenoid coacting therewith in parallel with the aforesaid electromagnet.

4:. A welding system comprising a source of welding current and a welding circuit including current-regulating means responsive to flow of welding current to introduce a given constant current-limiting efiect and a variable currentdimiting effect superposed thereon and tending compensatively to gradually increase the flow of welding current as the increase of welding resistance tends to decrease said current flow.

5. A welding system comprising a source of welding current and a welding circuit connected therewith and including currentregulating resistance and electro-responsive means in control thereofand adapted and arranged to introduce a fixed resistance component in response to initial flow of Welding current and to introduce a compensatively varying resistance component in response 't0 variations in strength of the welding current.

6. A welding system comprising a source of welding current and a welding circuit connected therewith and including resistance-varying means and two electro-responsive devices in control thereof, one responsive to initial flow of welding current to produce a fixed efi'ect on the resistancevarying means and the other responsive to variations in the intensity of said current to produce a graduated compensative effect on said resistance-varying means.

Signed at New York in the county of New York and State of New York this 17 day of Dec. A. D. 1914.

DAVID H. WILSON.

Witnesses:

MYRON F. HILL, C. M. HAMLIN; 

